(function (window, document, undefined) {
	var hearts = [];
	window.requestAnimationFrame = (function () {
		return (
			window.requestAnimationFrame ||
			window.webkitRequestAnimationFrame ||
			window.mozRequestAnimationFrame ||
			window.oRequestAnimationFrame ||
			window.msRequestAnimationFrame ||
			function (callback) {
				setTimeout(callback, 1000 / 60);
			}
		);
	})();
	init();
	function init() {
		css(
			".heart{width: 10px;height: 10px;position: fixed;background: #f00;transform: rotate(45deg);-webkit-transform: rotate(45deg);-moz-transform: rotate(45deg);}.heart:after,.heart:before{content: '';width: inherit;height: inherit;background: inherit;border-radius: 50%;-webkit-border-radius: 50%;-moz-border-radius: 50%;position: absolute;}.heart:after{top: -5px;}.heart:before{left: -5px;}"
		);
		attachEvent();
		gameloop();
	}
	function gameloop() {
		for (var i = 0; i < hearts.length; i++) {
			if (hearts[i].alpha <= 0) {
				document.body.removeChild(hearts[i].el);
				hearts.splice(i, 1);
				continue;
			}
			hearts[i].y--;
			hearts[i].scale += 0.004;
			hearts[i].alpha -= 0.013;
			hearts[i].el.style.cssText =
				'left:' +
				hearts[i].x +
				'px;top:' +
				hearts[i].y +
				'px;opacity:' +
				hearts[i].alpha +
				';transform:scale(' +
				hearts[i].scale +
				',' +
				hearts[i].scale +
				') rotate(45deg);background:' +
				hearts[i].color;
		}
		requestAnimationFrame(gameloop);
	}
	function attachEvent() {
		var old = typeof window.onclick === 'function' && window.onclick;
		window.onclick = function (event) {
			old && old();
			createHeart(event);
		};
	}
	function createHeart(event) {
		var d = document.createElement('div');
		d.className = 'heart';
		hearts.push({
			el: d,
			x: event.clientX - 5,
			y: event.clientY - 5,
			scale: 1,
			alpha: 1,
			color: randomColor()
		});
		document.body.appendChild(d);
	}
	function css(css) {
		var style = document.createElement('style');
		style.type = 'text/css';
		try {
			style.appendChild(document.createTextNode(css));
		} catch (ex) {
			style.styleSheet.cssText = css;
		}
		document.getElementsByTagName('head')[0].appendChild(style);
	}
	function randomColor() {
		return 'rgb(' + ~~(Math.random() * 255) + ',' + ~~(Math.random() * 255) + ',' + ~~(Math.random() * 255) + ')';
	}
})(window, document);
